Borrowings - SBA Debentures Interest Expense and Average Outstanding Balance (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 371	$ 391
Cash paid for interest expense	$ 4,997	$ 5,987
Effective interest rate	6.29%	6.29%
Average outstanding balance	$ 248,690	$ 290,963
SBA Debentures | Debentures
Debt Instrument [Line Items]
Stated interest expense	0	151
Amortization of debt issuance costs	0	20
Total interest and debt financing costs	0	171
Cash paid for interest expense	$ 0	$ 457
Effective interest rate	0.00%	3.25%
Average outstanding balance	$ 0	$ 21,046